A series of Co(II)−H 2 L coordination polymers were prepared with different auxiliary ligands, namely {5-{(anthracene-9-ylmethyl)-amino}isophthalic acid, bibp = 4,4′-bis(imidazolyl)biphenyl, bpy = 2,2′-bipyridine, bipd = 3,5-bis(1-imidazoly)pyridine, and bbibp = 4,4′-bis(benzoimidazo-1-yl)biphenyl), by a similar solvothermal method. X-ray diffraction analyses revealed that 1, 3, and 4 exhibit a two-dimensional (2D) structure, which further builds the threedimensional (3D) supramolecular architecture via the weakly interacting hydrogen bonds of C−H•••O, while 2 displayed a onedimensional (1D) double-chain architecture extended from two 1D zigzag chains by intermolecular hydrogen bonding interactions. The sensing experiments revealed that 1 and 2 can serve as either individual-and/or multi-responsive sensors to selectively detect Cr 3+ , Al 3+ , and Pb 2+ ions through the fluorescence turn-on effect, while 3−4 exhibited fluorescence turn-off sensing behavior for Fe 3+ ions. Moreover, 1−4 can effectively detect and recognize Cr 2 O 7 2− and CrO 4 2− due to their high selectivity and sensitivity for fluorescence quenching in aqueous solutions, and the sensing mechanism for various ions has been discussed.
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